Help please

Juliana • Mom of a 9 year old boy 6 year old girl and 2 year old girl ❤️

I had another ultrasound this time they saw a little white flicker she said that was the fetal pole she said it was measuring at 6 weeks 2 days but my gestational sack was measuring at 8 weeks and 2 days why is that what does that mean I go in next Wednesday again this time I meet my ob this is her findings the ultrasound tech